US 12,281,639 B2
Determining wind turbine rotor speed
Kristian Kiib, Skødstrup (DK); and Johnny Nielsen, Svenstrup J (DK)
Assigned to VESTAS WIND SYSTEMS A/S, Aarhus N (DK)
Appl. No. 18/557,872
Filed by VESTAS WIND SYSTEMS A/S, Aarhus N (DK)
PCT Filed Apr. 26, 2022, PCT No. PCT/DK2022/050084
§ 371(c)(1), (2) Date Oct. 27, 2023,
PCT Pub. No. WO2022/228630, PCT Pub. Date Nov. 3, 2022.
Claims priority of application No. PA 2021 70190 (DK), filed on Apr. 27, 2021.
Prior Publication US 2024/0240613 A1, Jul. 18, 2024
Int. Cl. F03D 7/04 (2006.01)
CPC F03D 7/042 (2013.01) [F05B 2260/821 (2013.01); F05B 2270/327 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method of determining a rotor speed of a wind turbine, the method comprising:
receiving angular velocity sensor data, from an angular velocity sensor located in a rotor hub of the wind turbine, indicative of an angular velocity of the rotor hub across a time interval;
receiving acceleration sensor data, from an acceleration sensor located in the rotor hub, indicative of an acceleration of the rotor hub in at least one radial direction relative to an axis of rotation of the rotor hub across the time interval;
determining a first estimated rotational speed of the rotor hub across the time interval based on the received angular velocity sensor data;
determining a second estimated rotational speed of the rotor hub across the time interval based on the received acceleration sensor data;
determining a correction value based on a difference between a mean value of the first estimated rotational speed for the time interval and a mean value of the second estimated rotational speed for the time interval;
applying the correction value to the first estimated rotational speed to determine the rotor speed of the wind turbine; and
controlling the wind turbine based on the determined rotor speed.